CN109338772B - Twisting forming production method for multilayer-structure ultrahigh-strength galvanized steel strand - Google Patents
Twisting forming production method for multilayer-structure ultrahigh-strength galvanized steel strand Download PDFInfo
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- CN109338772B CN109338772B CN201811324963.1A CN201811324963A CN109338772B CN 109338772 B CN109338772 B CN 109338772B CN 201811324963 A CN201811324963 A CN 201811324963A CN 109338772 B CN109338772 B CN 109338772B
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
- D07B7/02—Machine details; Auxiliary devices
- D07B7/022—Measuring or adjusting the lay or torque in the rope
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
- D07B7/02—Machine details; Auxiliary devices
- D07B7/025—Preforming the wires or strands prior to closing
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Abstract
The invention relates to a twisting and forming production method of a multilayer structure ultrahigh-strength galvanized steel strand. The production method adopts a pre-deformer for forming, and the pre-deformation amount is accurately controlled; the tension between the steel wires on the same layer is equal in the twisting process, the tension of the steel wires in the whole twisting process is kept constant, the defects of shrimp back and the like are avoided, the tension borne by the steel wires on different layers is gradually reduced from inside to outside, and the defects of lantern bubble and the like are avoided; the twisting stress of the steel strand is effectively controlled by controlling the twisting speed, the pressing amount of the pressing tile and the pressing amount of the rear deformer. The 1 × 37 and 1 × 61 multilayer structure ultrahigh-strength-level product produced in batches by the production method has excellent forming quality, is widely applied to domestic and foreign network construction projects, and creates considerable economic benefit.
Description
Technical Field
The invention relates to the field of deep processing of steel materials in the metallurgical industry, in particular to a twisting and forming production method of a multilayer-structure ultrahigh-strength galvanized steel strand.
Background
The ultrahigh-strength galvanized steel strand is used as a bearing steel core of a large-span power transmission cable, and has high strength grade and a complex structure. The galvanized steel stranded wire is twisted tightly according to the twisting quality requirement, and the phenomena of strand missing, strand breaking, strand loosening, bending, crossing and the like cannot occur. The tensile strength of the galvanized steel wire is up to above 1960MPa, the hardness is high, the stress is large, the forming difficulty of the steel wire is very large, and particularly, the steel wire has a multi-layer structure of 1x 37 and the like, so that the loss is huge once the forming process fails.
Disclosure of Invention
In order to solve the problems, the invention provides a twisting and forming production method of a multilayer-structure ultrahigh-strength galvanized steel strand, which can effectively control the pre-deformation amount of the steel wire, the twisting tension of the steel wire and the twisting stress of the steel strand.
The technical scheme adopted by the invention is as follows: a twisting and forming production method of a multilayer structure ultrahigh-strength galvanized steel strand comprises the following steps:
1) selecting pre-deformers according to the sequence of the number of layers of the galvanized steel strand to be twisted, uniformly distributing wire passing wheels on each disc of the pre-deformers, wherein the number of the wire passing wheels is equal to that of the steel wires on the corresponding layer, and adjusting the front and rear positions of the pre-deformers to ensure that the steel wires reach a folding point along a straight line;
2) adjusting the distance between the large disc and the small disc of the pre-deformer to be smaller than the pitch;
3) setting a twisting direction: the adjacent layers are twisted in opposite directions, and the outer layer is twisted in the right direction;
4) sequentially adjusting the deviation angle of the intermediate disc of the pre-deformer to enable the rotation height of the deformed steel wire to be 70-90% of the strand diameter;
5) the tension of the steel wires on the same layer is ensured to be equal, and the tension of the steel wires is reduced layer by layer from the inner layer to the outer layer;
6) the pressure of the line pressing tile is controlled to be 70% -80% of the maximum pressure;
7) the rolling reduction of the post deformer is 0.5-1 times of the diameter of the stranded wire;
8) the speed of the stranding machine is less than or equal to 20 m/min;
9) and inspecting the mechanical property and the forming quality of the stranded wire by cutting the head and the tail, and mainly inspecting the straightness, the lay length and the looseness of each layer of the finished stranded wire.
Preferably, in the step 1), the distance from the small disc of the pre-deformer to the folding opening is 1-2 times of the lay length.
Preferably, in the step 2), the distance between the large disc and the small disc of the pre-deformer is 90-95% of the pitch.
Preferably, in step 5), the tension of the steel wire is reduced layer by layer at a rate of 20%.
The beneficial effects obtained by the invention are as follows: the pre-deformer is adopted for forming, the pre-deformation amount is accurately controlled, and in order to reduce the loss of the pre-deformation process to the strength and stress of the galvanized steel wire, the structural design of the pre-deformer must be matched with the characteristics of a stranding machine and a steel strand. The distance between the large disc and the small disc of the pre-deformer must be smaller than the pitch, preferably 90-95% of the pitch, so that the steel wire is deformed conveniently; the deviation angle of the intermediate disc of the pre-deformer is proper, the rotation height of the deformed steel wire is about 70-90% of the strand diameter, the strand is loose and clamped when the deviation angle is too large and the deformation amount is too low, and the strand is loose when the deviation angle is too small and the deformation amount is too low; the distance from the small disc of the pre-deformer to the closure opening is reasonable, generally 1-2 times of the lay length, friction is easily generated when the pre-deformer is too close, the strength and the stress of a steel wire are lost, and the stranded wire is easily jumped when the pre-deformer is too far.
The most important thing in the twisting process is the control of the paying-off tension of the steel wire, if the tension is out of order and not controlled uniformly, the phenomena of non-uniform tightness and non-compact structure of the steel wire in the stranded wire can be caused. The tension between the steel wires on the same layer is equal, the tension of the steel wires in the whole twisting process is kept constant, and the defects of shrimp back and the like are avoided; the tension on the steel wires in different layers is reduced layer by layer from inside to outside, and the defects of 'lantern bulbs' and the like are avoided.
The twisting stress of the steel strand is effectively controlled by controlling the twisting speed (the speed requirement is less than or equal to 20m/min), the rolling reduction of the wire pressing tile and the rolling reduction of the post deformer.
The 1 × 37 and 1 × 61 multilayer structure ultrahigh-strength-level product produced in batches by the production method has excellent forming quality, is widely applied to domestic and foreign network construction projects, and creates considerable economic benefit. Wherein, the product is G6A-400-61/2.90mm trial-made in the Sutong Changjiang river step-over test of 'Huainan-Nanjing-Shanghai 1000kV extra-high voltage alternating current engineering', and the product is 400mm2The super-large section and the 4-layer 61-wire complex structure fill the blank in the same industry.
Drawings
FIG. 1 is a schematic diagram of a steel wire pre-deformation;
FIG. 2 is a schematic view of a 1X61 structural steel strand;
fig. 3 is a schematic diagram of the stress applied when twisting the steel wire.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments.
A twisting and forming production method of a multilayer structure ultrahigh-strength galvanized steel strand comprises the following steps:
1) selecting a pre-deformer according to the sequence of the number of layers of the galvanized steel strand to be twisted, uniformly distributing wire passing wheels on each disc of the pre-deformer, wherein the number of the wire passing wheels is equal to that of the steel wires on the corresponding layer, adjusting the front and rear positions of the pre-deformer to ensure that the steel wires reach a folding point P along a straight line, and the distance from a small disc C of the pre-deformer to the folding port is 1-2 times of the lay length;
2) adjusting the distance between the large disc A and the small disc C of the pre-deformer to be smaller than the pitch, wherein the distance is 90-95% of the pitch;
3) setting a twisting direction: the adjacent layers are twisted in opposite directions, and the outer layer is twisted in the right direction;
4) sequentially adjusting the deviation angle of the intermediate disc B of the pre-deformer to enable the rotation height of the deformed steel wire to be 70-90% of the strand diameter;
5) the tension of the steel wires on the same layer is equal, and the tension of the steel wires is reduced layer by layer from the inner layer to the outer layer, wherein the reduction rate is 20%;
6) the pressure of the line pressing tile is controlled to be 70% -80% of the maximum pressure;
7) the rolling reduction of the post deformer is 0.5-1 times of the diameter of the stranded wire;
8) the speed of the stranding machine is less than or equal to 20 m/min;
9) and inspecting the mechanical property and the forming quality of the stranded wire by cutting the head and the tail, and mainly inspecting the straightness, the lay length and the looseness of each layer of the finished stranded wire.
The production method of the invention is characterized in that the pre-deformation amount of the steel wire, the twisting tension of the steel wire and the twisting stress of the steel strand are controlled in the twisting process:
wire pre-deformation control
The twisting of the galvanized steel strand is carried out layer by layer, and each steel wire must be deformed in advance in order to ensure the forming quality. Meanwhile, in order to reduce the loss of the strength and stress of the galvanized steel wire in the pre-deformation process, the structural design of the pre-deformer must be matched with the characteristics of the stranding machine and the steel strand. Firstly, ensuring that the steel wire reaches a folding point P along a straight line; secondly, the wire passing wheels on each disc are required to be uniformly distributed, rotate flexibly and stably and are equal to the layer of steel wires in number; thirdly, the distance between the large disc A and the small disc C of the pre-deformer must be smaller than the pitch, preferably 90-95% of the pitch, so that the steel wire is deformed conveniently; the deviation angle of the intermediate disc B of the pre-deformer is proper, the rotation height of the deformed steel wire is about 70-90% of the strand diameter, the strand is loose and clamped due to too large deviation angle and too low deviation angle, and the strand is loose due to too small deviation angle and too low deformation; the distance from the small disc C of the pre-former to the folding opening is reasonable, generally 1-2 times of the lay length, friction is easily generated when the small disc C is too close, the strength and the stress of the steel wire are lost, and the stranded wire is easily jumped when the small disc C is too far. Fig. 1 is a schematic diagram of steel wire pre-deformation, wherein: a is a large disc of the pre-deformer, B is a middle disc of the pre-deformer, C is a small disc of the pre-deformer, a is a twisting angle, and P is a folding point of a folding opening.
Steel wire twisting tension control
The most important thing in the twisting process is the control of the paying-off tension of the steel wire. If the tension is out of order and not uniformly controlled, the phenomena of non-uniform tightness and non-compact structure of the steel wire in the stranded wire can be caused. Tension between steel wires on the same layer is equal, the tension of the steel wires in the whole twisting process is kept constant, and the defects of shrimp back and the like are avoided. Secondly, the tension on the steel wires in different layers is reduced layer by layer from inside to outside, and the defects of 'lantern bulbs' and the like are avoided. Fig. 2 is a schematic cross-sectional view of a 1 × 61 structural steel strand, which has four layers (M1, M2, M3, M4), each layer has opposite twisting directions, the outer layer has right twisting, the twisting radii of the layers are d, 2d, 3d, 4d (d is the diameter of the steel wire), the diameters of the twisting circles are gradually increased, and in order to ensure that the steel strand has a stable structure and is not loose, the twisting moments of the left and right twisting directions of the steel wire are required to be mutually offset as much as possible, so that the tension of the steel wire is gradually reduced from the inner layer to the outer layer, and the reduction ratio is about 20%.
Steel strand twisting stress control
(1) Influence of twisting speed on twisting stress
In the twisting process of the steel strand, the steel wire is driven by a basket of the planetary strander to do uniform circular motion and is driven by a traction wheel belt to do uniform linear motion, namely the steel wire is subjected to the dual actions of axial traction force F and radial torsional stress M, and the stress condition is shown in fig. 3. If the twisting speed is too fast, the stress concentration of the steel wires in the strand is easy to cause the strand blistering defect. Therefore, the speed of the stranding machine during stranding is required to be less than or equal to 20m/min and the stranding machine runs at a low speed. (2) The main effect of the pressing tile is to shape and size the stranded wire, so that the pressing tile must be pressed tightly. However, if the twisted wire is too tight, twisting stress is gradually accumulated backwards, so that twisting of the twisted wire is difficult; too loose, the steel wire can become the wave behind the stranded conductor crossing the line ball tile, leads to the surface unevenness. The pressure of the line pressing tile is controlled to be 70% -80% of the maximum pressure, and stable production can be realized.
(3) Influence of post-deformer draft on twisting stress
After the stranded steel strand is rolled by a plurality of groups of post deformers in the vertical and horizontal directions, the flatness of the stranded steel strand can be adjusted, the residual internal stress of the stranded steel strand is effectively eliminated, and the defects of snake shape (waving) and the like are avoided. The rolling reduction of the post deformer is generally 0.5-1 times of the diameter of the stranded wire.
Example one
The JG6A-500/230-37/2.79mm ultrahigh strength grade galvanized steel strand is produced by the twisting forming process as follows:
1) sequentially selecting three pre-deformers of 6 heads, 12 heads and 18 heads, adjusting the front and rear positions of the pre-deformers and ensuring that the steel wire reaches a folding point P along a straight line;
2) the distances between the large disk A and the small disk C of the pre-deformer are respectively 150mm, 213mm and 247 mm;
3) setting the twisting directions to be right, left and right respectively;
4) sequentially adjusting the deviation angle of the intermediate disc B of the pre-deformer to ensure that the rotary heights of the deformed steel wires are 7.5mm, 11.2mm and 13.7mm respectively;
5) ensuring that the tension of the steel wires on the same layer is equal, wherein the tension of the steel wires is respectively 30kgf, 25kgf and 20kgf from the inner layer to the outer layer;
6) the pressure of the line pressing tile is controlled to be 75% of the maximum pressure;
7) the pressing amount of the post deformer is respectively 6mm, 10mm and 15 mm;
8) the speed of the stranding machine is 20 m/min;
9) and inspecting the mechanical property and the forming quality of the stranded wire by cutting the head and the tail, and mainly inspecting the straightness, the lay length and the looseness of each layer of the finished stranded wire.
Example two
The JG6A-500/280-37/3.12mm ultrahigh strength grade galvanized steel strand is produced by the twisting forming process as follows:
1) sequentially selecting three pre-deformers of 6 heads, 12 heads and 18 heads, adjusting the front and rear positions of the pre-deformers and ensuring that the steel wire reaches a folding point P along a straight line;
2) the distances between the large disk A and the small disk C of the pre-deformer are 168mm, 238mm and 275mm respectively;
3) setting the twisting directions to be right, left and right respectively;
4) sequentially adjusting the deviation angle of the intermediate disc B of the pre-deformer to ensure that the rotary heights of the deformed steel wires are 8.4mm, 12.5mm and 15.3mm respectively;
5) the tension of the steel wires on the same layer is equal, and the tension of the steel wires is respectively 35kgf, 30kgf and 25kgf from the inner layer to the outer layer;
6) the pressure of the line pressing tile is controlled to be 75% of the maximum pressure;
7) the pressing amount of the post deformer is 7mm, 12mm and 16mm respectively;
8) the speed of the stranding machine is 17 m/min;
9) and inspecting the mechanical property and the forming quality of the stranded wire by cutting the head and the tail, and mainly inspecting the straightness, the lay length and the looseness of each layer of the finished stranded wire.
EXAMPLE III
The JG6A-500/400-61/2.90mm ultrahigh strength grade galvanized steel strand is produced by the twisting forming process as follows:
1) sequentially selecting four pre-deformers of 6 heads, 12 heads, 18 heads and 24 heads, adjusting the front and rear positions of the pre-deformers and ensuring that the steel wire reaches a folding point P along a straight line;
2) the distances between the large disk A and the small disk C of the pre-deformer are 177mm, 261mm, 329mm and 365mm respectively;
3) setting the twisting directions to be left, right, left and right respectively;
4) sequentially adjusting the deviation angle of the intermediate disc B of the pre-deformer to ensure that the rotary heights of the deformed steel wires are 7.8mm, 12.3mm, 16.2mm and 19.5mm respectively;
5) the tension of the steel wires in the same layer is equal, and the tension of the steel wires from the inner layer to the outer layer is 40kgf, 35kgf, 30kgf and 25kgf respectively.
6) The pressure of the line pressing tile is controlled to be 75% of the maximum pressure;
7) the pressing amount of the post deformer is respectively 6mm, 10mm, 15mm and 20 mm;
8) the speed of the stranding machine is 15 m/min;
9) and inspecting the mechanical property and the forming quality of the stranded wire by cutting the head and the tail, and mainly inspecting the straightness, the lay length and the looseness of each layer of the finished stranded wire.
The main performance indexes of the G6A strength grade galvanized steel wire are as follows: the tensile strength is more than or equal to 1960MPa (before twisting) and 1862MPa (after twisting), the 1% elongation stress is more than or equal to 1670MPa, the 360-degree torsion is more than or equal to 12 times, the 4D winding is not broken after 8 turns, and the weight of the zinc layer meets the requirement.
The final assay performance of the example product is as follows:
the foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A twisting and forming production method of a multilayer structure ultrahigh-strength galvanized steel strand comprises the following steps:
1) selecting pre-deformers according to the sequence of the number of layers of the galvanized steel strand to be twisted, uniformly distributing wire passing wheels on each disc of the pre-deformers, wherein the number of the wire passing wheels is equal to that of the steel wires on the corresponding layer, and adjusting the front and rear positions of the pre-deformers to ensure that the steel wires reach a folding point along a straight line; the distance from the small disc of the pre-deformer to the folding opening is 1-2 times of the lay length;
2) the distance between the large disc and the small disc of the pre-deformer is 90-95% of the pitch;
3) setting a twisting direction: the adjacent layers are twisted in opposite directions, and the outer layer is twisted in the right direction;
4) sequentially adjusting the deviation angle of the intermediate disc of the pre-deformer to enable the rotation height of the deformed steel wire to be 70-90% of the strand diameter;
5) the tension of the steel wires on the same layer is equal, and the tension of the steel wires is reduced layer by layer from the inner layer to the outer layer, wherein the reduction rate is 20%;
6) the pressure of the line pressing tile is controlled to be 70% -80% of the maximum pressure;
7) the rolling reduction of the post deformer is 0.5-1 times of the diameter of the stranded wire;
8) the speed of the stranding machine is less than or equal to 20 m/min;
9) and inspecting the mechanical property and the forming quality of the stranded wire by cutting the head and the tail, and mainly inspecting the straightness, the lay length and the looseness of each layer of the finished stranded wire.
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| CN201811324963.1A CN109338772B (en) | 2018-11-08 | 2018-11-08 | Twisting forming production method for multilayer-structure ultrahigh-strength galvanized steel strand |
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| CN201811324963.1A CN109338772B (en) | 2018-11-08 | 2018-11-08 | Twisting forming production method for multilayer-structure ultrahigh-strength galvanized steel strand |
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| CN109338772B true CN109338772B (en) | 2022-01-18 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4740188Y1 (en) * | 1969-12-16 | 1972-12-05 | ||
| CN104532633A (en) * | 2014-12-24 | 2015-04-22 | 鞍钢钢绳有限责任公司 | Method for controlling shaping rate of steel wire ropes |
| CN105206336A (en) * | 2015-10-09 | 2015-12-30 | 天津冶金集团中兴盛达钢业有限公司 | Large-section steel core aluminum stranded wire and manufacturing method thereof |
| EP3215671B1 (en) * | 2014-11-05 | 2019-09-11 | Teufelberger Fiber Rope GmbH | Rope made of textile fibre material |
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2018
- 2018-11-08 CN CN201811324963.1A patent/CN109338772B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4740188Y1 (en) * | 1969-12-16 | 1972-12-05 | ||
| EP3215671B1 (en) * | 2014-11-05 | 2019-09-11 | Teufelberger Fiber Rope GmbH | Rope made of textile fibre material |
| CN104532633A (en) * | 2014-12-24 | 2015-04-22 | 鞍钢钢绳有限责任公司 | Method for controlling shaping rate of steel wire ropes |
| CN105206336A (en) * | 2015-10-09 | 2015-12-30 | 天津冶金集团中兴盛达钢业有限公司 | Large-section steel core aluminum stranded wire and manufacturing method thereof |
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